This question may be better for another forum, but maybe someone can post a link to an existing answer: of the 3 stats people pay attention to here, Ahr, Hx, and SOH - are those all interpreted by LeafSpy, or are they more or less direct readings from values in the car? Meaning, how much of these numbers are reverse-engineered guesswork by the LeafSpy author? There is very little documentation about what's actually behind these values.

sandeen wrote:Wow, that may be the lowest Ahr I've seen. Which worries me a little

It seems that most '11-12 LEAFs drop the 4th bar at a higher SOC. Mine dropped at 43.3 AHr, for example. So I think that you have a good chance of making the warranty period.

sandeen wrote:3 stats people pay attention to here, Ahr, Hx, and SOH - are those all interpreted by LeafSpy, or are they more or less direct readings from values in the car?

AHr/Hx are directly from the car. I believe that SOH is a derived value based on the current AHr reading and 65 AHr or so - if not in LeafSpy it's done in the car, but I could be wrong. I wouldn't worry about that value, anyway - all you really care about is AHr.

drees wrote:AHr/Hx are directly from the car. I believe that SOH is a derived value based on the current AHr reading and 65 AHr or so - if not in LeafSpy it's done in the car, but I could be wrong. I wouldn't worry about that value, anyway - all you really care about is AHr.

I'm not sure about the bolded part. Here are some old posts from Turbo3. From searches (not reading threads and posts in detail), it looks like:

drees wrote:AHr/Hx are directly from the car. I believe that SOH is a derived value based on the current AHr reading and 65 AHr or so - if not in LeafSpy it's done in the car, but I could be wrong. I wouldn't worry about that value, anyway - all you really care about is AHr.

I'm not sure about the bolded part. Here are some old posts from Turbo3. From searches (not reading threads and posts in detail), it looks like:

old Hlth got renamed to HxSOH is a newer value

Everything that I can see shows that SOH is current AHr / 66.25 and calculated in LeafSpy. 66.25 AHr is the assumed capacity of a new battery.

Health => Hlth => Hx in LeafSpy.

Just grab a couple random LeafSpy screenshots and run the calculation and you'll see that the "new" capacity of a 24 kWh LEAF is 66.25 AHr.

More fun with charts; here's what I see for 4th bar drop by model year for Ahr & Hx. I only included ones for which I could find the forum post, not everything on the wiki. Clearly the 2013s behave differently, with the 4th bar drop at lower Ahr & higher Hx... There are a few weird outlier numbers, too. In particular co2112's numbers seem pretty far out of the normal range. Google sheet is here(Edit: Updated with a few more entries I found. Far more 2011s than 2012, though perhaps that's expected simply due to age. 2012s have a wider range on Ahr. Come on 2012's, show me what you've got!) (Last update: Removed co2112's outlier numbers, they were drop to 9th bar not drop of 9th bar, AFAICT; added a few more stats I found)

Last edited by sandeen on Sat Jun 24, 2017 2:43 pm, edited 2 times in total.

sandeen wrote:More fun with charts; here's what I see for 4th bar drop by model year for Ahr & Hx. I only included ones for which I could find the forum post, not everything on the wiki. Clearly the 2013s behave differently, with the 4th bar drop at lower Ahr & higher Hx... There are a few weird outlier numbers, too. In particular co2112's numbers seem pretty far out of the normal range. Google sheet is here

Just dropped my 4th bar! Last Sunday 7/9/2017 4/2013 leaf SL, was a southern cali car that we bought used in Utah last year 7/1/2016 with only 2 bars missing. Utah summer heat did it in. Leaf Spy: AHr = 42.10 SOH = 64% Hx = 57.69 39k miles, 1814 L1 chargesI still had 8 mo left on the warranty! Dealer got approval for the replacement no problem. Just waiting 4 weeks for the battery to come in.